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work progect

life sincince

atom the smallest particale of an elment
element a type of matter in which all the atoms are the same
radioactive decay the brakedown of a radioactive element, realsing particals and energy
geologic time scale is a record of the life forms and geolgic events in history
era units of time
period are subdivided units
Created by: horse girl
Popular Earth Science sets

 

 



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